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curl.c
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curl.c
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//? Marius Negrutiu (mailto:[email protected]) :: 2019/11/20
//? Make HTTP/S requests using libcurl
#include "main.h"
#include "curl.h"
#include <openssl/ssl.h>
#include "crypto.h"
typedef struct {
volatile HMODULE hPinnedModule;
CRITICAL_SECTION csLock;
CHAR szVersion[64];
CHAR szUserAgent[128];
} CURL_GLOBALS;
CURL_GLOBALS g_Curl = {0};
#define DEFAULT_HEADERS_VIRTUAL_SIZE CURL_MAX_HTTP_HEADER /// 100KB
#define DEFAULT_UKNOWN_VIRTUAL_SIZE 1024 * 1024 * 200 /// 200MB
//x #define DEBUG_TRANSFER_SLOWDOWN 50 /// Delays during transfer
// ----------------------------------------------------------------------
// TODO: Check if remote content has changed at /RECONNECT
// TODO: Client certificate (CURLOPT_SSLCERT, CURLOPT_PROXY_SSLCERT)
// TODO: Certificate revocation (CURLOPT_CRLFILE, CURLOPT_PROXY_CRLFILE)
// TODO: Secure Proxy (CURLOPT_PROXY_CAPATH, CURLOPT_PROXY_SSL_VERIFYHOST, CURLOPT_PROXY_SSL_VERIFYPEER)
// TODO: HPKP - HTTP public key pinning (CURLOPT_PINNEDPUBLICKEY, CURLOPT_PROXY_PINNEDPUBLICKEY)
// TODO: Time conditional request (CURLOPT_TIMECONDITION, CURLOPT_TIMEVALUE)
// TODO: Query SSL info (certificate chain, cypher, etc.)
// ----------------------------------------------------------------------
//+ CurlRequestSizes
void CurlRequestComputeNumbers( _In_ PCURL_REQUEST pReq, _Out_opt_ PULONG64 piSizeTotal, _Out_opt_ PULONG64 piSizeXferred, _Out_opt_ PSHORT piPercent, _Out_opt_ PBOOL pbDown )
{
assert( pReq );
// Uploading data goes first. Downloading server's response (remote content) goes second
if (pReq->Runtime.iUlTotal == 0 && pReq->Runtime.iDlTotal == 0 && pReq->Runtime.iResumeFrom > 0) {
// Connecting (phase 0)
if (pbDown)
*pbDown = TRUE;
if (piSizeTotal)
*piSizeTotal = 0;
if (piSizeXferred)
*piSizeXferred = pReq->Runtime.iResumeFrom;
if (piPercent)
*piPercent = -1; /// Unknown size
} else if (pReq->Runtime.iDlXferred > 0 || pReq->Runtime.iDlTotal > 0 || pReq->Runtime.iResumeFrom > 0) {
// Downloading (phase 2)
if (pbDown)
*pbDown = TRUE;
if (piSizeTotal)
*piSizeTotal = pReq->Runtime.iDlTotal + pReq->Runtime.iResumeFrom;
if (piSizeXferred)
*piSizeXferred = pReq->Runtime.iDlXferred + pReq->Runtime.iResumeFrom;
if (piPercent) {
*piPercent = -1; /// Unknown size
if (pReq->Runtime.iDlTotal + pReq->Runtime.iResumeFrom > 0)
*piPercent = (SHORT)(((pReq->Runtime.iDlXferred + pReq->Runtime.iResumeFrom) * 100) / (pReq->Runtime.iDlTotal + pReq->Runtime.iResumeFrom));
}
} else {
// Uploading (phase 1)
if (pbDown)
*pbDown = FALSE;
if (piSizeTotal)
*piSizeTotal = pReq->Runtime.iUlTotal;
if (piSizeXferred)
*piSizeXferred = pReq->Runtime.iUlXferred;
if (piPercent) {
*piPercent = -1; /// Unknown size
if (pReq->Runtime.iUlTotal > 0)
*piPercent = (SHORT)((pReq->Runtime.iUlXferred * 100) / pReq->Runtime.iUlTotal);
}
}
}
//+ CurlRequestFormatError
void CurlRequestFormatError( _In_ PCURL_REQUEST pReq, _In_opt_ LPTSTR pszError, _In_opt_ ULONG iErrorLen, _Out_opt_ PBOOLEAN pbSuccess, _Out_opt_ PULONG piErrorCode )
{
if (pszError)
pszError[0] = 0;
if (pbSuccess)
*pbSuccess = TRUE;
if (piErrorCode)
*piErrorCode = 0;
if (pReq) {
if (pReq->Error.iWin32 != ERROR_SUCCESS) {
// Win32 error code
if (pbSuccess) *pbSuccess = FALSE;
if (pszError) _sntprintf( pszError, iErrorLen, _T( "0x%x \"%s\"" ), pReq->Error.iWin32, pReq->Error.pszWin32 );
if (piErrorCode) *piErrorCode = pReq->Error.iWin32;
} else if (pReq->Error.iCurl != CURLE_OK) {
// CURL error
if (pbSuccess) *pbSuccess = FALSE;
if (pszError) _sntprintf( pszError, iErrorLen, _T( "0x%x \"%hs\"" ), pReq->Error.iCurl, pReq->Error.pszCurl );
if (piErrorCode) *piErrorCode = pReq->Error.iCurl;
} else {
// HTTP status
if (piErrorCode) *piErrorCode = pReq->Error.iHttp;
if ((pReq->Error.iHttp == 0) || (pReq->Error.iHttp >= 200 && pReq->Error.iHttp < 300)) {
if (pszError) _sntprintf( pszError, iErrorLen, _T( "OK" ) );
} else {
if (pbSuccess) *pbSuccess = FALSE;
if (pszError) {
// Some servers don't return the Reason-Phrase in their Status-Line (e.g. https://files.loseapp.com/file)
if (!pReq->Error.pszHttp) {
if (pReq->Error.iHttp >= 200 && pReq->Error.iHttp < 300) {
pReq->Error.pszHttp = MyStrDup( eA2A, "OK" );
} else if (pReq->Error.iHttp == 400) {
pReq->Error.pszHttp = MyStrDup( eA2A, "Bad Request" );
} else if (pReq->Error.iHttp == 401) {
pReq->Error.pszHttp = MyStrDup( eA2A, "Unauthorized" );
} else if (pReq->Error.iHttp == 403) {
pReq->Error.pszHttp = MyStrDup( eA2A, "Forbidden" );
} else if (pReq->Error.iHttp == 404) {
pReq->Error.pszHttp = MyStrDup( eA2A, "Not Found" );
} else if (pReq->Error.iHttp == 405) {
pReq->Error.pszHttp = MyStrDup( eA2A, "Method Not Allowed" );
} else if (pReq->Error.iHttp == 500) {
pReq->Error.pszHttp = MyStrDup( eA2A, "Internal Server Error" );
} else {
pReq->Error.pszHttp = MyStrDup( eA2A, "Error" );
}
}
_sntprintf( pszError, iErrorLen, _T( "%d \"%hs\"" ), pReq->Error.iHttp, pReq->Error.pszHttp );
}
}
}
}
}
//+ CurlRequestErrorType
LPCSTR CurlRequestErrorType( _In_ PCURL_REQUEST pReq )
{
if (pReq) {
if (pReq->Error.iWin32 != ERROR_SUCCESS) {
return "win32";
} else if (pReq->Error.iCurl != CURLE_OK) {
return "curl";
} else if (pReq->Error.iHttp >= 0) {
return "http";
}
}
return "";
}
//+ CurlRequestErrorCode
ULONG CurlRequestErrorCode( _In_ PCURL_REQUEST pReq )
{
if (pReq) {
if (pReq->Error.iWin32 != ERROR_SUCCESS) {
return pReq->Error.iWin32;
} else if (pReq->Error.iCurl != CURLE_OK) {
return pReq->Error.iCurl;
} else if (pReq->Error.iHttp > 0) {
return pReq->Error.iHttp;
}
}
return 0;
}
// ____________________________________________________________________________________________________________________________________ //
// //
//++ CurlInitialize
ULONG CurlInitialize()
{
TRACE( _T( "%hs()\n" ), __FUNCTION__ );
InitializeCriticalSection( &g_Curl.csLock );
{
// Plugin version
// Default user agent
TCHAR szBuf[MAX_PATH] = _T( "" ), szVer[MAX_PATH];
GetModuleFileName( g_hInst, szBuf, ARRAYSIZE( szBuf ) );
MyReadVersionString( szBuf, _T( "FileVersion" ), szVer, ARRAYSIZE( szVer ) );
MyStrCopy( eT2A, g_Curl.szVersion, ARRAYSIZE( g_Curl.szVersion ), szVer );
_snprintf( g_Curl.szUserAgent, ARRAYSIZE( g_Curl.szUserAgent ), "nscurl/%s", g_Curl.szVersion );
}
return ERROR_SUCCESS;
}
//++ CurlDestroy
void CurlDestroy()
{
TRACE( _T( "%hs()\n" ), __FUNCTION__ );
DeleteCriticalSection( &g_Curl.csLock );
}
//++ CurlInitializeLibcurl
ULONG CurlInitializeLibcurl()
{
if (InterlockedCompareExchangePointer( (void*)&g_Curl.hPinnedModule, NULL, NULL ) == NULL) {
TCHAR szPath[MAX_PATH];
TRACE( _T( "%hs()\n" ), __FUNCTION__ );
// Initialize libcurl
curl_global_init( CURL_GLOBAL_ALL );
//! CAUTION:
//? https://curl.haxx.se/libcurl/c/curl_global_cleanup.html
//? curl_global_cleanup does not block waiting for any libcurl-created threads
//? to terminate (such as threads used for name resolving). If a module containing libcurl
//? is dynamically unloaded while libcurl-created threads are still running then your program
//? may crash or other corruption may occur. We recommend you do not run libcurl from any module
//? that may be unloaded dynamically. This behavior may be addressed in the future.
// It's confirmed that NScurl.dll crashes when unloaded after curl_global_cleanup() gets called
// Easily reproducible in XP and Vista
//! We'll pin it in memory forever and never call curl_global_cleanup()
if (GetModuleFileName( g_hInst, szPath, ARRAYSIZE( szPath ) ) > 0) {
g_Curl.hPinnedModule = LoadLibrary( szPath );
assert( g_Curl.hPinnedModule );
}
// kernel32!GetModuleHandleEx is available in XP+
//x GetModuleHandleEx( GET_MODULE_HANDLE_EX_FLAG_PIN | GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, (LPCTSTR)__FUNCTION__, (HMODULE*)&g_Curl.hPinnedModule );
}
return ERROR_SUCCESS;
}
//++ CurlExtractCacert
//? Extract the built-in certificate storage to "$PLUGINSDIR\cacert.pem"
//? The function does nothing if the file already exists
ULONG CurlExtractCacert()
{
ULONG e = ERROR_SUCCESS;
assert( g_hInst != NULL );
assert( g_variables != NULL );
{
TCHAR szPem[MAX_PATH];
_sntprintf( szPem, ARRAYSIZE( szPem ), _T( "%s\\cacert.pem" ), getuservariableEx( INST_PLUGINSDIR ) );
if (!MyFileExists( szPem )) {
EnterCriticalSection( &g_Curl.csLock );
if (!MyFileExists( szPem )) /// Verify again
e = MySaveResource( (HMODULE)g_hInst, _T( "cacert.pem" ), MAKEINTRESOURCE( 1 ), 1033, szPem );
LeaveCriticalSection( &g_Curl.csLock );
}
}
return e;
}
//++ CurlFindHeader
void CurlFindHeader( _In_ LPCSTR pszHeaders, _In_ LPCSTR pszHeaderName, _Out_ LPTSTR pszHeaderValue, _In_ ULONG iMaxLen )
{
if (pszHeaderValue)
pszHeaderValue[0] = 0;
if (pszHeaders && *pszHeaders && pszHeaderName && *pszHeaderName) {
LPCSTR psz1, psz2;
int iHeaderLen = lstrlenA( pszHeaderName ), iLineLen;
for (psz1 = pszHeaders; psz1 && *psz1; ) {
for (psz2 = psz1; *psz2 != '\0' && *psz2 != '\r' && *psz2 != '\n'; psz2++);
iLineLen = (int)(psz2 - psz1);
if (iLineLen > iHeaderLen && psz1[iHeaderLen] == ':' && CompareStringA( CP_ACP, NORM_IGNORECASE, psz1, __min( iLineLen, iHeaderLen ), pszHeaderName, -1 ) == CSTR_EQUAL) {
for (psz1 += iHeaderLen + 1; *psz1 == ' ' || *psz1 == '\t'; psz1++);
MyStrCopyN( eA2T, pszHeaderValue, iMaxLen, psz1, (int)(psz2 - psz1) );
break;
}
for (psz1 = psz2; *psz1 == '\r' || *psz1 == '\n'; psz1++);
}
}
}
//++ CurlParseRequestParam
BOOL CurlParseRequestParam( _In_ ULONG iParamIndex, _In_ LPTSTR pszParam, _In_ int iParamMaxLen, _Out_ PCURL_REQUEST pReq )
{
BOOL bRet = TRUE;
assert( iParamMaxLen && pszParam && pReq );
if (iParamIndex == 0) {
//? Params[0] is always the HTTP method
//x assert(
//x lstrcmpi( pszParam, _T( "GET" ) ) == 0 ||
//x lstrcmpi( pszParam, _T( "POST" ) ) == 0 ||
//x lstrcmpi( pszParam, _T( "HEAD" ) ) == 0
//x );
MyFree( pReq->pszMethod );
pReq->pszMethod = MyStrDup( eT2A, pszParam );
} else if (iParamIndex == 1) {
//? Params[1] is always the URL
MyFree( pReq->pszURL );
pReq->pszURL = MyStrDup( eT2A, pszParam );
{ // Replace backslashes with slashes (\ -> /)
//? scheme://[user@]host[:port]/path[?query][#fragment]
LPSTR psz;
for (psz = (LPSTR)pReq->pszURL; *psz != '\0' && *psz != '?' && *psz != '#'; psz++)
if (*psz == '\\')
*psz = '/';
}
} else if (iParamIndex == 2) {
//? Params[2] is always the output file/memory
MyFree( pReq->pszPath );
if (lstrcmpi( pszParam, _T( "MEMORY" ) ) != 0)
pReq->pszPath = MyStrDup( eT2T, pszParam );
} else if (lstrcmpi( pszParam, _T( "/HEADER" ) ) == 0) {
if (popstring( pszParam ) == NOERROR && *pszParam) {
// The string may contain multiple headers delimited by \r\n
LPTSTR psz1, psz2;
LPSTR pszA;
UNREFERENCED_PARAMETER( pszA );
for (psz1 = pszParam; *psz1; ) {
for (; (*psz1 == _T('\r')) || (*psz1 == _T('\n')); psz1++); /// Skip \r\n
for (psz2 = psz1; (*psz2 != _T('\0')) && (*psz2 != _T('\r')) && (*psz2 != _T('\n')); psz2++); /// Find next \r\n\0
if (psz2 > psz1) {
if ((pszA = MyStrDupN( eT2A, psz1, (int)(psz2 - psz1) )) != NULL) {
pReq->pOutHeaders = curl_slist_append( pReq->pOutHeaders, pszA );
MyFree( pszA );
}
}
psz1 = psz2;
}
}
} else if (lstrcmpi( pszParam, _T( "/POST" ) ) == 0) {
LPSTR pszFilename = NULL, pszType = NULL, pszName = NULL, pszData = NULL;
IDATA Data;
/// Extract optional parameters "filename=XXX" and "type=XXX"
int e = NOERROR;
while (e == NOERROR) {
if ((e = popstring( pszParam )) == NOERROR) {
if (CompareString( CP_ACP, NORM_IGNORECASE, pszParam, 9, _T( "filename=" ), -1 ) == CSTR_EQUAL) {
pszFilename = MyStrDup( eT2A, pszParam + 9 );
} else if (CompareString( CP_ACP, NORM_IGNORECASE, pszParam, 5, _T( "type=" ), -1 ) == CSTR_EQUAL) {
pszType = MyStrDup( eT2A, pszParam + 5 );
} else {
break;
}
}
}
/// Extract mandatory parameters "name" and IDATA
if (e == NOERROR) {
pszName = MyStrDup( eT2A, pszParam );
if ((e = popstring( pszParam )) == NOERROR) {
if (IDataParseParam( pszParam, iParamMaxLen, &Data )) {
// Store 5-tuple MIME form part
pReq->pPostVars = curl_slist_append( pReq->pPostVars, pszFilename ? pszFilename : "" );
pReq->pPostVars = curl_slist_append( pReq->pPostVars, pszType ? pszType : "" );
pReq->pPostVars = curl_slist_append( pReq->pPostVars, pszName ? pszName : "" );
{
CHAR szType[] = {Data.Type, '\0'};
pReq->pPostVars = curl_slist_append( pReq->pPostVars, szType );
}
{
if (Data.Type == IDATA_TYPE_STRING) {
pszData = MyStrDup( eA2A, Data.Str );
} else if (Data.Type == IDATA_TYPE_FILE) {
pszData = MyStrDup( eT2A, Data.File );
} else if (Data.Type == IDATA_TYPE_MEM) {
pszData = EncBase64( Data.Mem, (size_t)Data.Size );
} else {
assert( !"Unexpected IDATA type" );
}
assert( pszData );
pReq->pPostVars = curl_slist_append( pReq->pPostVars, pszData );
}
IDataDestroy( &Data );
}
}
}
MyFree( pszFilename );
MyFree( pszType );
MyFree( pszName );
MyFree( pszData );
} else if (lstrcmpi( pszParam, _T( "/PROXY" ) ) == 0) {
if (popstring( pszParam ) == NOERROR && *pszParam) {
MyFree( pReq->pszProxy );
pReq->pszProxy = MyStrDup( eT2A, pszParam );
}
} else if (lstrcmpi( pszParam, _T( "/DATA" ) ) == 0) {
if (popstring( pszParam ) == NOERROR && *pszParam)
IDataParseParam( pszParam, iParamMaxLen, &pReq->Data );
} else if (lstrcmpi( pszParam, _T( "/RESUME" ) ) == 0) {
pReq->bResume = TRUE;
} else if (lstrcmpi( pszParam, _T( "/INSIST" ) ) == 0) {
pReq->bInsist = TRUE;
} else if (lstrcmpi( pszParam, _T( "/CONNECTTIMEOUT" ) ) == 0 || lstrcmpi( pszParam, _T( "/TIMEOUT" ) ) == 0) {
if (popstring( pszParam ) == NOERROR && *pszParam)
pReq->iConnectTimeout = (ULONG)MyStringToMilliseconds( pszParam );
} else if (lstrcmpi( pszParam, _T( "/COMPLETETIMEOUT" ) ) == 0) {
if (popstring( pszParam ) == NOERROR && *pszParam)
pReq->iCompleteTimeout = (ULONG)MyStringToMilliseconds( pszParam );
} else if (lstrcmpi( pszParam, _T( "/LOWSPEEDLIMIT" ) ) == 0) {
ULONG bps = popint();
if (popstring( pszParam ) == NOERROR && *pszParam) {
pReq->iLowSpeedLimit = bps;
pReq->iLowSpeedTime = (ULONG)MyStringToMilliseconds( pszParam ) / 1000;
pReq->iLowSpeedTime = __max( pReq->iLowSpeedTime, 3 ); /// seconds
}
} else if (lstrcmpi( pszParam, _T( "/SPEEDCAP" ) ) == 0) {
pReq->iSpeedCap = popint();
} else if (lstrcmpi( pszParam, _T( "/DEPEND" ) ) == 0) {
pReq->iDependencyId = popint();
} else if (lstrcmpi( pszParam, _T( "/REFERER" ) ) == 0 || lstrcmpi( pszParam, _T( "/REFERRER" ) ) == 0) {
if (popstring( pszParam ) == NOERROR && *pszParam) {
MyFree( pReq->pszReferrer );
pReq->pszReferrer = MyStrDup( eT2A, pszParam );
}
} else if (lstrcmpi( pszParam, _T( "/USERAGENT" ) ) == 0) {
if (popstring( pszParam ) == NOERROR && *pszParam) {
MyFree( pReq->pszAgent );
pReq->pszAgent = MyStrDup( eT2A, pszParam );
}
} else if (lstrcmpi( pszParam, _T( "/NOREDIRECT" ) ) == 0) {
pReq->bNoRedirect = TRUE;
} else if (lstrcmpi( pszParam, _T( "/AUTH" ) ) == 0) {
int e;
pReq->iAuthType = CURLAUTH_ANY;
if ((e = popstring( pszParam )) == NOERROR) {
if (CompareString( CP_ACP, NORM_IGNORECASE, pszParam, 5, _T( "type=" ), -1 ) == CSTR_EQUAL) {
LPCTSTR pszType = pszParam + 5;
if (lstrcmpi( pszType, _T( "basic" ) ) == 0)
pReq->iAuthType = CURLAUTH_BASIC;
else if (lstrcmpi( pszType, _T( "digest" ) ) == 0)
pReq->iAuthType = CURLAUTH_DIGEST;
else if (lstrcmpi( pszType, _T( "digestie" ) ) == 0)
pReq->iAuthType = CURLAUTH_DIGEST_IE;
else if (lstrcmpi( pszType, _T( "bearer" ) ) == 0)
pReq->iAuthType = CURLAUTH_BEARER;
e = popstring( pszParam );
}
if (e == NOERROR) {
// TODO: Encrypt user/pass/token in memory
if (pReq->iAuthType == CURLAUTH_BEARER) {
pReq->pszPass = MyStrDup( eT2A, pszParam ); /// OAuth 2.0 token (stored as password)
} else {
pReq->pszUser = MyStrDup( eT2A, pszParam );
if ((e = popstring( pszParam )) == NOERROR)
pReq->pszPass = MyStrDup( eT2A, pszParam );
}
}
}
} else if (lstrcmpi( pszParam, _T( "/TLSAUTH" ) ) == 0) {
if (popstring( pszParam ) == NOERROR) {
// TODO: Encrypt user/pass/token in memory
pReq->pszTlsUser = MyStrDup( eT2A, pszParam );
if (popstring( pszParam ) == NOERROR)
pReq->pszTlsPass = MyStrDup( eT2A, pszParam );
}
} else if (lstrcmpi( pszParam, _T( "/CACERT" ) ) == 0) {
if (popstring( pszParam ) == NOERROR) { /// pszParam may be empty ("")
MyFree( pReq->pszCacert );
pReq->pszCacert = MyStrDup( eT2A, pszParam );
}
} else if (lstrcmpi( pszParam, _T( "/CERT" ) ) == 0) {
if (popstring( pszParam ) == NOERROR && *pszParam) {
/// Validate SHA1 hash
if (lstrlen( pszParam ) == 40) {
int i;
for (i = 0; isxdigit( pszParam[i] ); i++);
if (i == 40) {
LPSTR psz = MyStrDup( eT2A, pszParam );
if (psz) {
pReq->pCertList = curl_slist_append( pReq->pCertList, psz );
MyFree( psz );
}
}
}
}
} else if (lstrcmpi( pszParam, _T( "/DEBUG" ) ) == 0) {
int e = popstring( pszParam );
if (e == NOERROR && lstrcmpi( pszParam, _T( "nodata" ) ) == 0) {
pReq->bNoDebugData = TRUE;
e = popstring( pszParam );
}
if (e == NOERROR && *pszParam) {
MyFree( pReq->pszDebugFile );
pReq->pszDebugFile = MyStrDup( eT2T, pszParam );
}
} else if (lstrcmpi( pszParam, _T( "/TAG" ) ) == 0) {
if (popstring( pszParam ) == NOERROR) { /// pszParam may be empty ("")
MyFree( pReq->pszTag );
if (*pszParam)
pReq->pszTag = MyStrDup( eT2A, pszParam );
}
} else if (lstrcmpi( pszParam, _T( "/MARKOFTHEWEB" ) ) == 0 || lstrcmpi( pszParam, _T( "/Zone.Identifier" ) ) == 0) {
pReq->bMarkOfTheWeb = TRUE;
} else if (lstrcmpi( pszParam, _T( "/DOH" ) ) == 0) {
if (popstring( pszParam ) == NOERROR) { /// pszParam may be empty ("")
MyFree( pReq->pszDOH );
if (*pszParam)
pReq->pszDOH = MyStrDup( eT2A, pszParam );
}
} else {
bRet = FALSE; /// This parameter is not valid for Request
}
return bRet;
}
//++ OpenSSLVerifyCallback
int OpenSSLVerifyCallback( int preverify_ok, X509_STORE_CTX *x509_ctx )
{
//? This function gets called to evaluate server's SSL certificate chain
//? The calls are made sequentially for each certificate in the chain
//? This usually happens three times per connection: #2(root certificate), #1(intermediate certificate), #0(user certificate)
//? Our logic:
//? * We return TRUE for every certificate, to get a chance to inspect the next in chain
//? * We return the final value when we reach the last certificate (depth 0)
//? If we're dealing with a TRUSTED certificate we force a positive response
//? Otherwise we return whatever verdict OpenSSL has already assigned to the chain
UCHAR Thumbprint[20]; /// sha1
char szThumbprint[41];
struct curl_slist *p;
SSL *ssl = X509_STORE_CTX_get_ex_data( x509_ctx, SSL_get_ex_data_X509_STORE_CTX_idx() );
SSL_CTX *ssl_ctx = SSL_get_SSL_CTX( ssl );
PCURL_REQUEST pReq = (PCURL_REQUEST)SSL_CTX_get_app_data( ssl_ctx );
X509 *cert = X509_STORE_CTX_get_current_cert( x509_ctx ); /// Current certificate in chain
int err = X509_STORE_CTX_get_error( x509_ctx ); /// Current OpenSSL certificate validation error
int depth = X509_STORE_CTX_get_error_depth( x509_ctx ); /// Certificate index/depth in the chain. Starts with root certificate (e.g. #2), ends with user certificate (#0)
//x X509_NAME_oneline( X509_get_subject_name( cert ), szSubject, ARRAYSIZE( szSubject ) );
//x X509_NAME_oneline( X509_get_issuer_name( cert ), szIssuer, ARRAYSIZE( szIssuer ) );
// Extract certificate SHA1 fingerprint
X509_digest( cert, EVP_sha1(), Thumbprint, NULL );
MyFormatBinaryHexA( Thumbprint, sizeof( Thumbprint ), szThumbprint, sizeof( szThumbprint ) );
// Verify against our trusted certificate list
for (p = pReq->pCertList; p; p = p->next) {
if (lstrcmpiA( p->data, szThumbprint ) == 0) {
pReq->Runtime.bTrustedCert = TRUE;
X509_STORE_CTX_set_error( x509_ctx, X509_V_OK );
break;
}
}
// Verdict
if (depth > 0) {
TRACE( _T( "Certificate( #%d, \"%hs\", PreVerify{OK:%hs, Err:%d} ) = %hs, Response{OK:%hs, Err:%d}\n" ), depth, szThumbprint, preverify_ok ? "TRUE" : "FALS", err, p ? "TRUSTED" : "UNKNOWN", "TRUE", err );
return TRUE;
} else {
if (pReq->Runtime.bTrustedCert) {
/// We've found at least one TRUSTED certificate
/// Clear all errors, return a positive verdict
X509_STORE_CTX_set_error( x509_ctx, X509_V_OK );
TRACE( _T( "Certificate( #%d, \"%hs\", PreVerify{OK:%hs, Err:%d} ) = %hs, Response{OK:%hs, Err:%d}\n" ), depth, szThumbprint, preverify_ok ? "TRUE" : "FALS", err, p ? "TRUSTED" : "UNKNOWN", "TRUE", X509_V_OK );
return TRUE;
}
/// We haven't found any TRUSTED certificate
/// Return whatever verdict already made by OpenSSL
TRACE( _T( "Certificate( #%d, \"%hs\", PreVerify{OK:%hs, Err:%d} ) = %hs, Response{OK:%hs, Err:%d}\n" ), depth, szThumbprint, preverify_ok ? "TRUE" : "FALS", err, p ? "TRUSTED" : "UNKNOWN", preverify_ok ? "TRUE" : "FALS", err );
return preverify_ok;
}
}
//++ CurlSSLCallback
//? This callback function gets called by libcurl just before the initialization of an SSL connection
CURLcode CurlSSLCallback( CURL *curl, void *ssl_ctx, void *userptr )
{
SSL_CTX *pssl = (SSL_CTX*)ssl_ctx;
SSL_CTX_set_app_data( pssl, userptr );
SSL_CTX_set_verify( pssl, SSL_VERIFY_PEER, OpenSSLVerifyCallback);
return CURLE_OK;
}
//++ CurlHeaderCallback
size_t CurlHeaderCallback( char *buffer, size_t size, size_t nitems, void *userdata )
{
PCURL_REQUEST pReq = (PCURL_REQUEST)userdata;
LPSTR psz1, psz2;
assert( pReq && pReq->Runtime.pCurl );
//x TRACE( _T( "%hs( \"%hs\" )\n" ), __FUNCTION__, buffer );
// NOTE: This callback function receives incoming headers one at a time
// Headers from multiple (redirected) connections are separated by an empty line ("\r\n")
// We only want to keep the headers from the last connection
if (pReq->Runtime.InHeaders.iSize == 0 || /// First connection
(
pReq->Runtime.InHeaders.iSize > 4 &&
pReq->Runtime.InHeaders.pMem[pReq->Runtime.InHeaders.iSize - 4] == '\r' &&
pReq->Runtime.InHeaders.pMem[pReq->Runtime.InHeaders.iSize - 3] == '\n' &&
pReq->Runtime.InHeaders.pMem[pReq->Runtime.InHeaders.iSize - 2] == '\r' &&
pReq->Runtime.InHeaders.pMem[pReq->Runtime.InHeaders.iSize - 1] == '\n')
)
{
// The last received header is an empty line ("\r\n")
// Discard existing headers and start collecting a new set
VirtualMemoryReset( &pReq->Runtime.InHeaders );
// Extract HTTP status text from header
// e.g. "HTTP/1.1 200 OK" -> "OK"
// e.g. "HTTP/1.1 404 NOT FOUND" -> "NOT FOUND"
// e.g. "HTTP/1.1 200 " -> Some servers don't return the Reason-Phrase in their Status-Line (e.g. https://files.loseapp.com/file)
MyFree( pReq->Error.pszHttp );
for (psz1 = buffer; (*psz1 != ' ') && (*psz1 != '\0'); psz1++); /// Find first whitespace
if (*psz1++ == ' ') {
for (; (*psz1 != ' ') && (*psz1 != '\0'); psz1++); /// Find second whitespace
if (*psz1++ == ' ') {
for (psz2 = psz1; (*psz2 != '\r') && (*psz2 != '\n') && (*psz2 != '\0'); psz2++); /// Find trailing \r\n
if (psz2 > psz1)
pReq->Error.pszHttp = MyStrDupN( eA2A, psz1, (int)(psz2 - psz1) );
}
}
// Collect HTTP connection info
/// Server IP address
curl_easy_getinfo( pReq->Runtime.pCurl, CURLINFO_PRIMARY_IP, &psz1 );
MyFree( pReq->Runtime.pszServerIP );
pReq->Runtime.pszServerIP = MyStrDup( eA2A, psz1 );
/// Server port
curl_easy_getinfo( pReq->Runtime.pCurl, CURLINFO_PRIMARY_PORT, &pReq->Runtime.iServerPort );
// Collect last effective URL
MyFree( pReq->Runtime.pszFinalURL );
curl_easy_getinfo( pReq->Runtime.pCurl, CURLINFO_EFFECTIVE_URL, &psz1 );
pReq->Runtime.pszFinalURL = MyStrDup( eA2A, psz1 );
}
// Collect incoming headers
return VirtualMemoryAppend( &pReq->Runtime.InHeaders, buffer, size * nitems );
}
//++ CurlReadCallback
size_t CurlReadCallback( char *buffer, size_t size, size_t nitems, void *instream )
{
curl_off_t l = 0;
PCURL_REQUEST pReq = (PCURL_REQUEST)instream;
assert( pReq && pReq->Runtime.pCurl );
#ifdef DEBUG_TRANSFER_SLOWDOWN
Sleep( DEBUG_TRANSFER_SLOWDOWN );
#endif
if (pReq->Data.Type == IDATA_TYPE_STRING || pReq->Data.Type == IDATA_TYPE_MEM) {
// Input string/memory buffer
assert( pReq->Runtime.iDataPos <= pReq->Data.Size );
l = __min( size * nitems, pReq->Data.Size - pReq->Runtime.iDataPos );
CopyMemory( buffer, (PCCH)pReq->Data.Str + pReq->Runtime.iDataPos, (size_t)l );
pReq->Runtime.iDataPos += l;
} else if (pReq->Data.Type == IDATA_TYPE_FILE) {
// Input file
if (MyValidHandle( pReq->Runtime.hInFile )) {
ULONG iRead;
if (ReadFile( pReq->Runtime.hInFile, (LPVOID)buffer, size * nitems, &iRead, NULL )) {
l = iRead;
pReq->Runtime.iDataPos += iRead;
} else {
l = CURL_READFUNC_ABORT;
}
}
} else {
assert( !"Unexpected IDATA type" );
}
//x TRACE( _T( "%hs( Size:%u ) = Size:%u\n" ), __FUNCTION__, (ULONG)(size * nitems), (ULONG)l );
return (size_t)l;
}
//++ CurlWriteCallback
size_t CurlWriteCallback( char *ptr, size_t size, size_t nmemb, void *userdata )
{
PCURL_REQUEST pReq = (PCURL_REQUEST)userdata;
assert( pReq && pReq->Runtime.pCurl );
#ifdef DEBUG_TRANSFER_SLOWDOWN
Sleep( DEBUG_TRANSFER_SLOWDOWN );
#endif
if (MyValidHandle( pReq->Runtime.hOutFile )) {
// Write to output file
ULONG iWritten = 0;
if (WriteFile( pReq->Runtime.hOutFile, ptr, (ULONG)(size * nmemb), &iWritten, NULL )) {
return iWritten;
} else {
pReq->Error.iWin32 = GetLastError();
pReq->Error.pszWin32 = MyFormatError( pReq->Error.iWin32 );
}
} else {
// Initialize output virtual memory (once)
if (!pReq->Runtime.OutData.pMem) {
curl_off_t iMaxSize;
if (curl_easy_getinfo( pReq->Runtime.pCurl, CURLINFO_CONTENT_LENGTH_DOWNLOAD_T, &iMaxSize ) != CURLE_OK)
iMaxSize = DEFAULT_UKNOWN_VIRTUAL_SIZE;
if (iMaxSize == -1)
iMaxSize = DEFAULT_UKNOWN_VIRTUAL_SIZE;
VirtualMemoryInitialize( &pReq->Runtime.OutData, (SIZE_T)iMaxSize );
}
// Write to RAM
return VirtualMemoryAppend( &pReq->Runtime.OutData, ptr, size * nmemb );
}
return 0;
}
//++ CurlProgressCallback
int CurlProgressCallback( void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow )
{
PCURL_REQUEST pReq = (PCURL_REQUEST)clientp;
curl_off_t iSpeed;
curl_off_t iTimeElapsed, iTimeRemaining = 0;
assert( pReq && pReq->Runtime.pCurl );
if (TermSignaled())
return CURLE_ABORTED_BY_CALLBACK;
if (CurlRequestGetAbortFlag( pReq ) != FALSE)
return CURLE_ABORTED_BY_CALLBACK;
//x TRACE( _T( "%hs( DL:%I64u/%I64u, UL:%I64u/%I64u )\n" ), __FUNCTION__, dlnow, dltotal, ulnow, ultotal );
curl_easy_getinfo( pReq->Runtime.pCurl, CURLINFO_TOTAL_TIME_T, &iTimeElapsed );
if (dlnow > 0) {
/// Downloading (phase 2)
curl_easy_getinfo( pReq->Runtime.pCurl, CURLINFO_SPEED_DOWNLOAD_T, &iSpeed );
iTimeRemaining = (dltotal * iTimeElapsed) / dlnow - iTimeElapsed;
} else {
/// Uploading (phase 1)
curl_easy_getinfo( pReq->Runtime.pCurl, CURLINFO_SPEED_UPLOAD_T, &iSpeed );
if (ulnow > 0)
iTimeRemaining = (ultotal * iTimeElapsed) / ulnow - iTimeElapsed;
}
pReq->Runtime.iTimeElapsed = GetTickCount() - pReq->Runtime.iTimeStart; /// Aggregated elapsed time
pReq->Runtime.iTimeRemaining = iTimeRemaining / 1000; /// us -> ms
pReq->Runtime.iDlTotal = dltotal;
pReq->Runtime.iDlXferred = dlnow;
pReq->Runtime.iUlTotal = ultotal;
pReq->Runtime.iUlXferred = ulnow;
pReq->Runtime.iSpeed = iSpeed;
MemoryBarrier();
return CURLE_OK;
}
//++ CurlDebugCallback
int CurlDebugCallback( CURL *handle, curl_infotype type, char *data, size_t size, void *userptr )
{
PCURL_REQUEST pReq = (PCURL_REQUEST)userptr;
assert( pReq && pReq->Runtime.pCurl == handle );
if (type == CURLINFO_HEADER_OUT) {
// NOTE: This callback function receives outgoing headers all at once
// A block of outgoing headers are sent for every (redirected) connection
// We'll collect only the last block
VirtualMemoryReset( &pReq->Runtime.OutHeaders );
VirtualMemoryAppend( &pReq->Runtime.OutHeaders, data, size );
} else if (type == CURLINFO_HEADER_IN) {
// NOTE: This callback function receives incoming headers one at a time
// NOTE: Incoming header are handled by CurlHeaderCallback(..)
}
// Debug file
if (MyValidHandle( pReq->Runtime.hDebugFile )) {
ULONG iBytes;
BOOLEAN bNoData = FALSE; //? /DEBUG nodata <file>
// Prefix
{
LPSTR psz;
switch (type) {
case CURLINFO_TEXT: psz = "[-] "; break;
case CURLINFO_HEADER_IN: psz = "[<h] "; break;
case CURLINFO_HEADER_OUT: psz = "[>h] "; break;
case CURLINFO_DATA_IN: psz = "[<d] "; bNoData = pReq->bNoDebugData; break;
case CURLINFO_DATA_OUT: psz = "[>d] "; bNoData = pReq->bNoDebugData; break;
case CURLINFO_SSL_DATA_IN: psz = "[<s] "; break;
case CURLINFO_SSL_DATA_OUT: psz = "[>s] "; break;
default: psz = "[?] ";
}
WriteFile( pReq->Runtime.hDebugFile, psz, lstrlenA( psz ), &iBytes, NULL );
}
// Data
if (bNoData) {
LPSTR psz;
TCHAR szSize[64];
MyFormatBytes( size, szSize, ARRAYSIZE( szSize ) );
if ((psz = MyStrDup( eT2A, szSize )) != NULL) {
WriteFile( pReq->Runtime.hDebugFile, psz, (ULONG)lstrlenA(psz), &iBytes, NULL );
WriteFile( pReq->Runtime.hDebugFile, "\n", 1, &iBytes, NULL );
MyFree( psz );
}
} else {
const size_t iMaxLen = 1024 * 128;
const size_t iLineLen = 512;
LPSTR pszLine;
if ((pszLine = (LPSTR)malloc( iLineLen )) != NULL) {
for (size_t iOutLen = 0; iOutLen < iMaxLen; ) {
size_t i, n = __min( iLineLen, size - iOutLen );
if (n == 0)
break;
for (i = 0; i < n; i++) {
pszLine[i] = data[iOutLen + i];
if (pszLine[i] == '\n') {
i++;
break;
} else if ((pszLine[i] < 32 || pszLine[i] > 126) && pszLine[i] != '\r' && pszLine[i] != '\t') {
pszLine[i] = '.';
}
}
WriteFile( pReq->Runtime.hDebugFile, pszLine, (ULONG)i, &iBytes, NULL );
if (i < 1 || pszLine[i - 1] != '\n')
WriteFile( pReq->Runtime.hDebugFile, "\n", 1, &iBytes, NULL );
iOutLen += i;
}
free( pszLine );
}
}
}
return 0;
}
//++ CurlTransfer
void CurlTransfer( _In_ PCURL_REQUEST pReq )
{
CURL *curl;
curl_mime *form = NULL;
CHAR szError[CURL_ERROR_SIZE] = ""; /// Runtime error buffer
BOOL bGET;
#define StringIsEmpty(psz) ((psz) != NULL && ((psz)[0] == 0))
if (!pReq)
return;
if (!pReq->pszURL || !*pReq->pszURL) {
pReq->Error.iWin32 = ERROR_INVALID_PARAMETER;
pReq->Error.pszWin32 = MyFormatError( pReq->Error.iWin32 );
return;
}
// HTTP GET
bGET = StringIsEmpty( pReq->pszMethod ) || (lstrcmpiA( pReq->pszMethod, "GET" ) == 0);
// Extract "$PLUGINSDIR\cacert.pem" once
if (pReq->pszCacert == NULL) /// pszCacert == NULL means embedded cacert.pem
CurlExtractCacert();
// Input file
if (pReq->pszMethod && (
lstrcmpiA( pReq->pszMethod, "PUT" ) == 0 ||
(lstrcmpiA( pReq->pszMethod, "POST" ) == 0 && !pReq->pPostVars)
))
{
if (pReq->Data.Type == IDATA_TYPE_FILE) {
ULONG e = ERROR_SUCCESS;
pReq->Runtime.hInFile = CreateFile( (LPCTSTR)pReq->Data.File, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, 0, NULL );
if (MyValidHandle( pReq->Runtime.hInFile )) {
// NOTE: kernel32!GetFileSizeEx is only available in XP+
LARGE_INTEGER l;
l.LowPart = GetFileSize( pReq->Runtime.hInFile, (PULONG)&l.HighPart );
if (l.LowPart != INVALID_FILE_SIZE) {
/// Store file size in iDataSize
pReq->Data.Size = l.QuadPart;
} else {
e = GetLastError();
}
} else {
e = GetLastError();
}
if (e != ERROR_SUCCESS && pReq->Error.iWin32 == ERROR_SUCCESS) {
pReq->Error.iWin32 = e;
pReq->Error.pszWin32 = MyFormatError( e );
TRACE( _T( "[!] CreateFile( DataFile:%s ) = %s\n" ), (LPCTSTR)pReq->Data.File, pReq->Error.pszWin32 );
}
}
}
// Output file
if (pReq->pszPath && *pReq->pszPath) {
ULONG e = ERROR_SUCCESS;
MyCreateDirectory( pReq->pszPath, TRUE ); // Create intermediate directories
pReq->Runtime.hOutFile = CreateFile( pReq->pszPath, GENERIC_WRITE, FILE_SHARE_READ, NULL, (pReq->bResume ? OPEN_ALWAYS : CREATE_ALWAYS), FILE_ATTRIBUTE_NORMAL, NULL );
if (MyValidHandle( pReq->Runtime.hOutFile )) {
/// Resume?
if (pReq->bResume) {
LARGE_INTEGER l;
l.LowPart = GetFileSize( pReq->Runtime.hOutFile, (PULONG)&l.HighPart );
if (l.LowPart != INVALID_FILE_SIZE) {
pReq->Runtime.iResumeFrom = l.QuadPart;
if (SetFilePointer( pReq->Runtime.hOutFile, 0, NULL, FILE_END ) == INVALID_SET_FILE_POINTER) {
e = GetLastError();
}
} else {
e = GetLastError();
}
}
} else {
e = GetLastError();
}
if (e == ERROR_SUCCESS && pReq->bMarkOfTheWeb) {
ULONG l = lstrlen( pReq->pszPath ) + sizeof( ":Zone.Identifier" );
LPTSTR psz = (LPTSTR)MyAlloc( l * sizeof( TCHAR ) );
if (psz) {
HANDLE h;
_sntprintf( psz, l, _T( "%s:Zone.Identifier" ), pReq->pszPath );
if ((h = CreateFile( psz, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, 0, NULL )) != INVALID_HANDLE_VALUE) {
CHAR zone[] = "[ZoneTransfer]\r\nZoneId=3\r\n";
WriteFile( h, (LPCVOID)zone, lstrlenA( zone ), &l, NULL );
CloseHandle( h );
}
MyFree( psz );
}
}
if (e != ERROR_SUCCESS && pReq->Error.iWin32 == ERROR_SUCCESS) {
pReq->Error.iWin32 = e;
pReq->Error.pszWin32 = MyFormatError( e );
TRACE( _T( "[!] CreateFile( OutFile:%s ) = %s\n" ), pReq->pszPath, pReq->Error.pszWin32 );
}
}
// Debug file
if (pReq->pszDebugFile && *pReq->pszDebugFile) {
ULONG e = ERROR_SUCCESS;
MyCreateDirectory( pReq->pszDebugFile, TRUE ); // Create intermediate directories
pReq->Runtime.hDebugFile = CreateFile( pReq->pszDebugFile, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL );
if (!MyValidHandle( pReq->Runtime.hOutFile )) {
e = GetLastError();
TRACE( _T( "[!] CreateFile( DebugFile:%s ) = 0x%x\n" ), pReq->pszDebugFile, e );
}
}
if (pReq->Error.iWin32 == ERROR_SUCCESS) {
// Transfer
curl = curl_easy_init(); // TODO: Cache
if (curl) {
/// Remember it
pReq->Runtime.pCurl = curl;
pReq->Runtime.iTimeStart = GetTickCount();
/// Error buffer
szError[0] = ANSI_NULL;
curl_easy_setopt( curl, CURLOPT_ERRORBUFFER, szError );
curl_easy_setopt( curl, CURLOPT_USERAGENT, pReq->pszAgent ? pReq->pszAgent : g_Curl.szUserAgent );
if (pReq->pszReferrer)
curl_easy_setopt( curl, CURLOPT_REFERER, pReq->pszReferrer );
if (pReq->bNoRedirect) {
curl_easy_setopt( curl, CURLOPT_FOLLOWLOCATION, FALSE );
} else {
curl_easy_setopt( curl, CURLOPT_FOLLOWLOCATION, TRUE ); /// Follow redirects
curl_easy_setopt( curl, CURLOPT_MAXREDIRS, 10 );
}
if (pReq->iConnectTimeout > 0)
curl_easy_setopt( curl, CURLOPT_CONNECTTIMEOUT_MS, pReq->iConnectTimeout );
if (pReq->iCompleteTimeout > 0)
curl_easy_setopt( curl, CURLOPT_TIMEOUT_MS, pReq->iCompleteTimeout );
if (pReq->iSpeedCap > 0) {
curl_easy_setopt( curl, CURLOPT_MAX_SEND_SPEED_LARGE, (curl_off_t)pReq->iSpeedCap );
curl_easy_setopt( curl, CURLOPT_MAX_RECV_SPEED_LARGE, (curl_off_t)pReq->iSpeedCap );
}
if (pReq->iLowSpeedLimit > 0) {
curl_easy_setopt( curl, CURLOPT_LOW_SPEED_LIMIT, (long)pReq->iLowSpeedLimit );
if (pReq->iLowSpeedTime > 0)
curl_easy_setopt( curl, CURLOPT_LOW_SPEED_TIME, (long)pReq->iLowSpeedTime );
}
if (pReq->pszDOH)
curl_easy_setopt( curl, CURLOPT_DOH_URL, pReq->pszDOH );
curl_easy_setopt( curl, CURLOPT_ACCEPT_ENCODING, "" ); /// Send Accept-Encoding header with all supported encodings